1 files changed, 75 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Buffers/MemoryManager.cs b/src/System.Private.CoreLib/shared/System/Buffers/MemoryManager.cs
new file mode 100644
index 000000000..1b235b538
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/System/Buffers/MemoryManager.cs
@@ -0,0 +1,75 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Runtime.CompilerServices;
+
+namespace System.Buffers
+{
+    /// <summary>
+    /// Manager of <see cref="System.Memory{T}"/> that provides the implementation.
+    /// </summary>
+    public abstract class MemoryManager<T> : IMemoryOwner<T>, IPinnable
+    {
+        /// <summary>
+        /// Returns a <see cref="System.Memory{T}"/>.
+        /// </summary>
+        public virtual Memory<T> Memory => new Memory<T>(this, GetSpan().Length);
+
+        /// <summary>
+        /// Returns a span wrapping the underlying memory.
+        /// </summary>
+        public abstract Span<T> GetSpan();
+
+        /// <summary>
+        /// Returns a handle to the memory that has been pinned and hence its address can be taken.
+        /// </summary>
+        /// <param name="elementIndex">The offset to the element within the memory at which the returned <see cref="MemoryHandle"/> points to. (default = 0)</param>
+        public abstract MemoryHandle Pin(int elementIndex = 0);
+
+        /// <summary>
+        /// Lets the garbage collector know that the object is free to be moved now.
+        /// </summary>
+        public abstract void Unpin();
+
+        /// <summary>
+        /// Returns a <see cref="System.Memory{T}"/> for the current <see cref="MemoryManager{T}"/>.
+        /// </summary>
+        /// <param name="length">The element count in the memory, starting at offset 0.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        protected Memory<T> CreateMemory(int length) => new Memory<T>(this, length);
+
+        /// <summary>
+        /// Returns a <see cref="System.Memory{T}"/> for the current <see cref="MemoryManager{T}"/>.
+        /// </summary>
+        /// <param name="start">The offset to the element which the returned memory starts at.</param>
+        /// <param name="length">The element count in the memory, starting at element offset <paramref name="start"/>.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        protected Memory<T> CreateMemory(int start, int length) => new Memory<T>(this, start, length);
+
+        /// <summary>
+        /// Returns an array segment.
+        /// <remarks>Returns the default array segment if not overriden.</remarks>
+        /// </summary>
+        protected internal virtual bool TryGetArray(out ArraySegment<T> segment)
+        {
+            segment = default;
+            return false;
+        }
+
+        /// <summary>
+        /// Implements IDisposable.
+        /// </summary>
+        void IDisposable.Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Clean up of any leftover managed and unmanaged resources.
+        /// </summary>
+        protected abstract void Dispose(bool disposing);
+
+    }
+}